Response to Streaks on film!

Maybe dust speckles on the lens. With a wide-angle lens on a sunny day (= closed aperture), marks on the front or rear surface of the lens may become visible as dark spots on the finished print.

Other suggestion: a hair (or something else) in the shutter, which makes a shadow on the negative when the shutter is opened.

Anyway, if it's always on the same position and if it's dark on the final print, it should be something in the light path of the camera. The more DOF you have, the better it becomes visible.

Regards

Georg

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